DID DirtStars are the best in my experience, especially the ST-X. Better than Excel Takasago series, and every bit as good if not better than A60's. The best part about them is that they are currently available, not back ordered for months like Excels. Most of the top supercross racers are running dirt stars this season. Excel is losing market shar since they dropped the ball this past year. Expect to see much more DID rims out there from now on.
FYI, the rims that DID makes for Honda OE are not dirtstars. Honda demands lightweight rims, so the material used is not the same quality as the premium rims. The DID guys told me that pros used to run the Honda OEM rims for years and rarely bent them. Not sure why, but maybe it has to do with running on closed, groomed courses. All I know is that DID makes a great product, and they're now the only rim made in Japan.